VIA recently demonstrated a working prototype of a dual-core x86 processor at Computex 2010 in Taiwan.
The NANO DC chip is a dual-core CPU that employs a VN1000 Digital Media Chipset and has a clock speed of 1.6GHz. It also has full support for dual-channel DDR3 memory. The first noticeable drawback will most likely be the manufacturing process used. At 65nm, power efficiency probably won’t be the CPU’s strongest asset. On the other hand, VIA reportedly stated that this wasn’t the final form of the chip, so there is still room for optimizations.